Radio loud-speaker



New 255;.19-30; F. BAEHN 9 9 9 RADIO LOUD SPEAKER Filed Feb. 15, 1929 IN VEN TOR.

ATTORNEY Patented Nov. 25, 1930 FREDERICK BAEHK, F JERSEY CITY, NEW'JERSEY :ssnro roun-srnsxnia Application filed February 16, 1929. Serial No. 340,508.

This invention has reference to the loud speakers used with radio receiving sets, and particularly relates to the horn parts, by which the sound waves produced by the v1- brations of the loud speaker unit actuated from the receiying set are distributed to the air in the vicinity.

The object of this invention is to provide a simple, and much more efiicient means for leading out the sound waves from the loud speakerunit, and which can be economically constructed, and which will occupy no more space or room' than the average form of loud speaker.

In the accompanying drawing. one embodiment of my invention:

Figure 1 is a side elevation, partly in section.

Figure 2 is a section taken on the line 2 -2 of Fig. 1.

As shown in the drawing I provide a base in the form of a shell 3 of somewhat cup form, which has an opening 4 in the top wall, at which'portion the outlet tube 5 of a radio sounding unit 6 is attached. An upright leader tube is mounted on top of the base to convey the sound waves upwardly.

As shown a tube 7 that may be of wood, is

held by apertured lugs 8 on topof the base 3; and this tube may be provided with a metal lining tube 9 that has a smooth bore, to permit free travel of the sound waves up through the tube from the unit.

I further provide a horn 10 of conical form, that is preferably made of wood. At the smaller end of the horn I secure a' baffie plate that provides an upright wall which is fiat and very smooth on its inner face, and which-plate is preferably of metal, or other very hard substance. ThisQ-bafiie plate as shown is in the form of a disk 11 with beveled edges, that is inserted from the large end of the horn and will rest against the inner wall of the horn at the end by its edges as shown. This disk has a threaded stem 12 on its outer face, that is passed through a collar 13,-and receives a nut 14. It will be understood that when the nut is screwed up it will press the collar against the end of the horn and clamp the bafile 15 showing plate or disk in the position sl iown, that will close the smaller end of the horn.

The horn 10 is provided with an. opening 15 on the lower side,- throu gh which the leader tube 7 passes,and an annular bracket 16 surrounds the tube -7 and also surrounds this opening in the horn, and

the bracket is secured to the horn and also to the upright tube by in the bracket.

At its upper end the tube. 'i' connects with screws passing through suitable holes an extension 17 of wood similar to the upright tube 7, and which is provided with a lining tube 18 0f connects with the upright tu metal. This extension be on a miter joint, and as shown the extension will project rearward through the axis of the horn. The rear open end of the extension terminates a short distance in front of the baffle plate 11.

It will thus be seen that the sound waves.

from the sounding unit will pass upwardly through the leader tube 7, and then travel through the extension tube 1 7 and [as they emerge from the latter will strike the bafiie plate .11. This will cause the sound waves to be reflected, that will then travel forward through the horn in a divergent manner and be emitted from the large end of the horn in a very efficient manner.

What I claim is 1. In a radio loud speaker, the combination at the top,

a chambered base adapted to carry ;a speaker unit, and provided with an opening a leader tube extending upward which the leader tube extends, a bracket securing the leader tube and horn together at said opening whereby the horn is supported on the leader tube, the leader tube having an extension at its upper end that projects rearward in the axis of the horn and ends a short distance in front of the said battle plate whereby the sound waves are d forward and out of the horn, s

comprising a disk with a be sorted in the horn end with a eflected to pass aid bafile plate veled edge inthreaded stem extending outward from the disk, a collar on the stem that engages the end-of the horn,

and a nut on the stem that presses on the collar to draw the disk against the inner wall of the horn.

2. In a radio loud speaker, the combination of a chambered base adapted to carry a speaker unit, andprovidedwith an opening at the top, a-lead er tube extending upward from the base to lead the sound waves upward, a horn of conical shape with the smaller end closed by a hard baffle plate, the horn having an opening at one side, throrgh which the leader tube extends a bracket securing the I leader tube and horn together at said opening whereby the horn is supported on the leader tube, the leader tube having an extension at its upper end that projects rearward in the axis of the horn and ends a-short dis tance in front of the said baffle plate whereby the sound waves are deflected to pass forward and out of the horn, said bafile plate comprising a disk with a beveled edge inserted in the horn end with a threaded stern extending outward from the disk, a collar on the stem that engages the end of the horn and a nut on the stem that presses on the collar to draw the disk against the inner wall of the horn, the leader tube being composed of wood with a metal lining.

Signed at New York city, N. Y., February 14,1929.

FREDERICK BAEHN. 

